Hi, I am looking for a new coolant temperature sensor (I have warning lights, not gauges). I believe I need a single prong temp sensor. When I look up rock Auto and other placed a double prong comes up. When I look up the coolant sensor on Fusick, I get "D1891". When I google D1891 (believe this is the original AC Delco number), I cannot find it anywhere else except on ebay. I ordered one from ebay last week and it was 28 years old and did not work (ohm meter also showed no current).

I don't mind ordering from Fusick but it takes long. Is there another coolant sensor part number with single prong that will work?

If I order the double prong, can I just put the connector on the hot side? How to tell? Thanks!

 

The temp sensor switch will not show conductivity until it is in a overheat condition, around 240*. Ohming it at room temperature means nothing.

 

I guess there then is not reasonable way to check that your coolant temperature sensor (warning light) works properly without overheating one's engine.

 

Boiling water is only 210*, not hot enough to test the sensor. You can carefully test it with a butane lighter flame, just don't get it too hot.

 

Antifreeze would take the heat enough, if you can heat it outside and not breathe it.

 

The original temp switch is P/N 1193582, which is AC number D1858. Never use the RockAuto catalog as a reliable source of part fitment info.

 

Thank you guys. Joe, Amazon has a D1858D, has an extra D on the end. Do you think that would be okay? Perhaps they just made an approvement?

Out of curiosity, how did you find out the correct AC Delco part number? I take it you have the old part list from 1967?

 

I have no idea what the "D" signifies. Yes, I have a library of original Olds parts books. And note that the sender needs to be correct for the car, not the engine. If you were asking for a sender for a 1967 425, you were going to get the two terminal sender that the full size cars used.

 

Well, there's no guarantee that the Amazon item photos are in any way correct, but compare this photo of what is supposed to be a D1858D with the one I posted above of D1858.

 

If all you care about is a sender that works, Standard Motor Products TS11 is about $7.50 at RockAuto.

 

Thank you Joe - yes, that's all I care about . I coolant sensor that works for a HOT warning light. Will buy.

 

I bought it just now from Oreilly because I can get it by tomorrow morning by 8 AM for the same total price. What is funny is Oreilly's website says this in not-compatible with a 67 442- look like their inventory is not updated.

 

Most parts stores rely on manufacturer's application lists, so if one has it wrong, they pretty much all do.